Pronunciation: (ô-rôr'u, ô-rōr'u, u-rôr'u, u-rōr'u),[key] —n. 1. the ancient Roman goddess of the dawn. Cf. Eos. 2. (l.c.) dawn.
3. (l.c.) Meteorol.a radiant emission from the upper atmosphere that occurs sporadically over the middle and high latitudes of both hemispheres in the form of luminous bands, streamers, or the like, caused by the bombardment of the atmosphere with charged solar particles that are being guided along the earth's magnetic lines of force.
4. a city in central Colorado, near Denver. 158,588.
5. a city in NE Illinois. 81,293.
6. a female given name.